Insert Interval

Insert Interval array

Given a set of non-overlapping intervals, insert a new interval into the intervals (merge if necessary).

You may assume that the intervals were initially sorted according to their start times.

Example 1:

Given intervals [1,3],[6,9], insert and merge [2,5] in as [1,5],[6,9].

Example 2:

Given[1,2],[3,5],[6,7],[8,10],[12,16], insert and merge [4,9] in as [1,2],[3,10],[12,16].

This is because the new interval [4,9] overlaps with [3,5],[6,7],[8,10].

Insert Interval Solution

/**
 * Definition for an interval.
 * public class Interval {
 *     int start;
 *     int end;
 *     Interval() { start = 0; end = 0; }
 *     Interval(int s, int e) { start = s; end = e; }
 * }
 */
public class InsertInterval {
    public List<Interval> insert(List<Interval> intervals, Interval newInterval) {
        int i = 0;

        while(i < intervals.size() && intervals.get(i).end < newInterval.start) {
            i++;
        }

        while(i < intervals.size() && intervals.get(i).start <= newInterval.end) {
            newInterval = new Interval(Math.min(intervals.get(i).start, newInterval.start), Math.max(intervals.get(i).end, newInterval.end));
            intervals.remove(i);
        }

        intervals.add(i, newInterval);

        return intervals;
    }
}

Last modified October 4, 2020